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Gestion des déchets minéraux industriels : de l'inertage à la valorisation matière : application aux effluents et boues d'hydroxydes à base de fer, zinc et nickel

Abstract : The treatment process of liquid waste containing heavy metals by metal hydroxyde precipitation is the most commonly employed. At the present time, the sludge are an ultimate waste wich are stored in landfilling. In a first time, the objective is the inertizing of heavy metal like zinc. The principle of transformation of leaching forms containing heavy metal in metallic sulfides slightly soluble appears like a way to explore. The present work confirms that a sulfurization of mineralogic form of zinc containing in sludge is faisable from polysulfides solutions. The performance of this process is confirmed in the case of real sample stemming from industry. In a second time, we studied the possibility of the selective extraction method by leaching of zinc-bearing phases. Chemical leaching of ZnO and Zn(OH)2 with a solution of inorganic ligand as thiosulphate and organic ligand such as polyethylene-polyamine appeared to be an efficient method. This detoxication method has been validated using these reagents on the real hydroxyde sludge stemming from industry. The result confirms that this treatment led to the extraction of the potential polluting zinc fraction contained in the waste. The last method studied the possibility of selective precipitation of heavy metal contained in liquid waste before classical physicochemical treatment. The reducing power of polysulfides and the formation possibility of metallic sulfides slighthly soluble bring about the selective precipitation of zinc sulfide and nickel in mixte solution of fer-zinc-nickel. The treatment of liquid waste containing heavy metal is possible. The final-products are a sulfur-metallic sulfur heavy metal mixture and an hydroxie ferric cake. The use of this products as new materials in different industries is actually under study
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Pascal Muller. Gestion des déchets minéraux industriels : de l'inertage à la valorisation matière : application aux effluents et boues d'hydroxydes à base de fer, zinc et nickel. Autre. Université Paul Verlaine - Metz, 1997. Français. ⟨NNT : 1997METZ021S⟩. ⟨tel-01777206⟩

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